系统级双轴旋转调制捷联惯导误差分析及标校

Error analysis and calibration of systematic dual-axis rotation-modulating SINS

旋转调制技术可以调制惯性器件常值误差,有效提高惯导系统的长航时导航精度。出于一种旋转调制式捷联惯导系统的研制需求,从旋转调制式捷联惯导的基本原理出发,提出了一种系统级双轴旋转调制式捷联惯导工程实现方案,并对其系统误差特性进行了深入的分析及仿真,找出了影响系统长航时导航精度的误差源。基于此。为了能仅利用系统自身旋转机构就可对主要误差源进行估计补偿,提出了一种系统级自标校方案。通过计算机仿真表明:此方案可以对影响系统长航时精度的主要误差项进行精确估计,是一种有效可行的系统级标校方案。

The SINS based on Rotation-modulation technology can reduce the effect of constant drift of Inertial Instruments, and effectively improve the long-time navigation accuracy. To develop a SINS based on the Rotation-modulation technology, a scheme of systematic dual-axis Rotation-modulating SINS （RSINS） based on the basic principle of RSINS is presented, and its long-time navigation error characteristic is simulated and analyzed. The main errors which cause the long-time navigation error are found, and a systematic self-calibration scheme is presented which can calibrate those errors only with its own rotating frame. Finally, the systematic calibration scheme is tested by computer simulation. The result shows that the main errors, which cause the long-time navigation error, can be estimated accurately, and it is a feasible method.